Claude Sonnet 5.5 vs MiniMax M3.1 Flash
Harvey LAB-AA 1.1?
Sonnet 5.5at max2.8
MiniMax M3.1 Flash—
SpireClimb?
Sonnet 5.5at max1.3
MiniMax M3.1 Flash—
SpireClimb StS1 A20 Heart?
Sonnet 5.5at max0
MiniMax M3.1 Flash—
SpireClimb StS2 A10?
Sonnet 5.5at max2.7
MiniMax M3.1 Flash—
| Benchmark | Sonnet 5.5 | MiniMax M3.1 Flash |
|---|---|---|
| AutomationBench-AA | 59.4 | 72.5 |
| GDPval-AA (work tasks) 2.1 | 1,558.1 | 1,465.7 |
| Terminal-Bench 4.0 | 43.9 | 25.8 |
| Terminal-Bench Science 0.1 | 34.3 | 3.3 |
| AA-Briefcase 1.1 · Elo | 1,634.1 | 1,473.4 |
| AA-LCR (long context) 1.1 | 78 | 79.7 |
| FrontierCode 1.1 | 44.3 | 38.6 |
| AA Analyst Agent | 57.5 · max | — |
| DeepSWE 1.1 | 70.5 · max | — |
| Harvey LAB-AA 1.1 | 2.8 · max | — |
| SWE-bench Pro (v2 full) | 95.8 · xhigh | — |
| SWE-bench Pro (v2 hard) | 70.6 · xhigh | — |
| Furniture Assembly | 75 · max | — |
| SpireClimb | 1.3 · max | — |
| SpireClimb StS1 A20 Heart | 0 · max | — |
| SpireClimb StS2 A10 | 2.7 · max | — |
Specs
| Spec | Sonnet 5.5 | MiniMax M3.1 Flash |
|---|---|---|
| Input, per 1M | $2 | $0.15 |
| Output, per 1M | $10 | $0.60 |
| Cost per task? | $0.88 | $0.22 |
| Speed, tok/s | 106 | 121 |
| Context | 1M | 1M |
| Weights | Closed | Closed |
| Released | Sep 2026 | Oct 2026 |
| See images | ✓ | ✓ |
| Read PDFs | ✓ | — |
| Hear audio | — | — |
| Watch video | — | ✓ |
| Call tools | ✓ | ✓ |
| Force a tool call | — | ? |
| Return strict JSON | ✓ | — |
| Search the web | ✓ | ? |
| Run code | ✓ | ? |
| Use a computer | ✓ | ? |
What breaks when you switch
Sonnet 5.5 → MiniMax M3.1 Flash
No PDF input
No strict JSON
Complete model response must be appended›
In multi-turn tools, preserve the complete assistant response, including reasoning_content and tool_calls, to maintain reasoning continuity.
MiniMax M3.1 Flash → Sonnet 5.5
No forced tool use›
Forced tool_choice any or tool returns HTTP 400; remove the forced choice.
Replace disabled thinking›
Disabled thinking returns HTTP 400; use between_tools for the lowest thinking setting.
No manual thinking budgets›
Manual thinking budgets and extra between_tools fields return HTTP 400; remove manual budgets and send between_tools without display, budget_tokens or block_binding.
Remove sampling parameters›
Non-default temperature, top_p or top_k returns HTTP 400; remove these parameters.
No assistant prefill›
A prefilled final assistant turn returns HTTP 400; remove that prefill.
Old computer tool rejected · Claude API / Google Cloud›
The computer_20251124 tool returns HTTP 400 on the Claude API and Google Cloud; use computer_toolset_20260801 there.